Ignition Power Stage: Testing and Inspection

CHECKING IGNITION COIL POWER OUTPUT STAGE

REQUIREMENTS
^ Camshaft Position (CMP) Sensor (G40) OK.
^ Engine Speed (RPM) Sensor (G28) OK.
^ Electrical testing, test step 22 OK.
^ Ignition Coil (N152) OK.




CHECKING VOLTAGE SUPPLY
- Disconnect ignition wire and 3-pin connector from Ignition Coil (N152).
- Connect Fluke 83 multimeter with adapter cables from VW 1594 to measure voltage between terminals -1- and -3- of disconnected connector.
- Switch ignition ON.

^ Specified value: approx. Battery Positive Voltage (B+).

- Switch ignition OFF.




CONTROL CHECKING
- Disconnect harness connectors from the Fuel Injectors for cylinders 1 and 4, and remove fuse 18 (S18).
- Connect US 1115 LED tester to connector terminals 2 and 3 using adaptor cables from VW 1594 adaptor kit and VW 1594/15.
- Operate Starter and check ignition signal from Motronic Engine Control Module (ECM).

^ LED should flicker.

- If LED does not flicker:

- Replace Motronic Engine Control Module.
- Connect 3-pin connector and ignition wire on Ignition Coil.



- Connect LED tester with adapter cables to terminals -1- and -15- on Ignition Coil.

WARNING: During the following test DO NOT touch the Ignition Coil or test leads terminals.

- Switch ignition ON.

^ LED must light up for 1-2 seconds.

- Operate Starter.

^ LED should flicker

- If LED does not flicker:

- Replace Ignition Coil Power Output Stage.
- Connect connector to Fuel Injectors.
- Reinstall fuse 18 (S18).